Hello and welcome Janet. I am sorry there is no record for a William George Hayler buiral at St Martins.
I found a marriage on 22 June 1863 for William George Hayler, Batchelor, Full Age, occupation Brassfounder father Thomas Hayler occupation Groom and Marie Bates Spinster, Full age father William Bates occupation Brassfounder. Witnesses Charles Holyoake and Emma Partridge.
The only other record is a baptisim 27 Feb 1850 Charles and Mary Ann Hayler parents Thomas occupation Ostler and Frances. Abode Little Bow Street.
I hope this is of some help.